<template>
  <div class="song-audio">
    <audio  muted ref="player"
            :src="url"
            controls="controls"
            preload="true"
            @canplay="startPlay"
            @ended="ended"
            @timeupdate="timeUpdate"
    ></audio>
  </div>
</template>
<script>
import {mapGetters} from 'vuex';
export default {
  name: 'song-audio',
  computed: {
    ...mapGetters([
      'id',
      'url',
      'isPlay',
      'listOfSongs',     //当前歌曲列表
      'curTime',         //当前音乐的播放位置
      'changeTime',      //指定播放时刻
      'autoNext',        //用于自动触发播放下一首
      'volume'           //音量
    ])
  },
  watch: {
    //监听播放还是暂停
    isPlay: function () {
      this.togglePlay();
    },
    //跳转到指定播放时刻
    changeTime() {
      this.$refs.player.currentTime = this.changeTime;
    },
    //改变音量
    volume(val) {
      this.$refs.player.volume = val;
    }
  },
  methods: {
    //获取链接后准备播放
    startPlay() {
      let player = this.$refs.player;
      this.$store.commit('setDuration',player.duration)
      //开始播放
      player.play();
      this.$store.commit('setIsPlay',true)
    },
    //播放完成之后触发
    ended() {
      this.$store.commit('setIsPlay',false);
      this.$store.commit('setCurTime',0);
      this.$store.commit('setAutoNext',!this.autoNext)
    },
    //开始、暂停
    togglePlay() {
      let player = this.$refs.player;
      if (this.isPlay) {
        player.play();
      } else {
        player.pause();
      }
    },
    //音乐播放时记录音乐的播放位置
    timeUpdate(){
      this.$store.commit('setCurTime',this.$refs.player.currentTime);
    }
  }

}

</script>

<style>
.song-audio {
  display: inline;
}
</style>
